RCW 57.20.120

A district may contract indebtedness in excess of the amount named in RCW 57.20.110, but not exceeding in amount, together with existing indebtedness, two and one-half percent of the value of the taxable property in that district, as the term "value of the taxable property" is defined in RCW 39.36.015, and impose excess property tax levies to retire the indebtedness whenever a ballot proposition authorizing the indebtedness and excess levies is approved as provided under Article VII, section 2, and Article VIII, section 6, of the state Constitution, at an election to be held in the district in the manner provided by this title and RCW 39.36.050.